Apparatus and method for formation evaluation

Abstract

A method for acquiring a sample of a virgin fluid from a subsurface formation penetrated by a wellbore surrounded by a layer of contaminated fluid is disclosed. The method includes abutting a first packer against a wall of the wellbore, and extending at least a portion of a second packer beyond the first packer, wherein the second packer is at least partially disposed in the first packer. An inlet to a first flowline is at least partially defined by the first packer, and an inlet to a second flowline is defined by the second packer. The method further includes drawing one of virgin fluid, contaminated fluid and combinations thereof into the first flowline; and drawing virgin fluid into the second flowline.

1. A method, comprising:
 extending a probe from a downhole tool into contact with a wall of a wellbore penetrating a subsurface formation, the probe including a packer for creating a seal against the wall of the wellbore, a sampling intake, a cleanup intake, and a tubular divider disposed in a bore of the packer for engaging the wall of the wellbore; 
 producing fluid from the formation about the tubular divider; 
 drawing fluid from inside the tubular divider into the sampling intake; 
 drawing fluid from inside and outside the tubular divider into the cleanup intake; 
 flowing fluid through a first flow line coupled to the sampling intake and through a second flow line coupled to the cleanup intake; 
 capturing fluid from the first flow line into a sample chamber; and 
 discharging fluid from the second flow line into the wellbore. 
 
     
     
       2. The method of  claim 1  further comprising isolating two annular passageways of the cleanup intake with the tubular divider. 
     
     
       3. The method of  claim 1  further comprising obtaining a property of the fluid flowing through at least one of the first flow line and the second flow line. 
     
     
       4. The method of  claim 1  further comprising filtering the fluid flowing through at least one of the first flow line and the second flow line. 
     
     
       5. The method of  claim 1  further comprising admitting the fluid from inside the tubular divider into a sampling tube. 
     
     
       6. The method of  claim 1  further comprising equalizing the pressure between the sampling intake and the cleanup intake. 
     
     
       7. The method of  claim 1  further comprising preventing the fluid from outside the tubular divider from mixing with the fluid entering the sampling intake. 
     
     
       8. The method of  claim 1  further comprising restricting an inlet area of an annular passageway outside the tubular divider with an inner flange at the mouth of the packer.